Add OpenTelemetry tracing and log export via OTLP

Shared telemetry init module in compliance-core (behind `telemetry` feature)
sets up OTLP/gRPC export for traces and logs when OTEL_EXPORTER_OTLP_ENDPOINT
is set. Falls back to console-only output when unset.

Both agent and dashboard now use the shared init. Docker Compose includes
an OTel Collector service with a config template for SigNoz, Grafana
Tempo/Loki, Jaeger, etc.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

otel-collector-config.yaml

@@ -0,0 +1,52 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
+
+processors:
+  batch:
+    timeout: 5s
+    send_batch_size: 1024
+
+exporters:
+  # Log to stdout for debugging
+  debug:
+    verbosity: basic
+
+  # Configure your backend below. Examples:
+  #
+  # SigNoz:
+  #   otlp/signoz:
+  #     endpoint: "signoz-otel-collector:4317"
+  #     tls:
+  #       insecure: true
+  #
+  # Grafana Tempo (traces):
+  #   otlp/tempo:
+  #     endpoint: "tempo:4317"
+  #     tls:
+  #       insecure: true
+  #
+  # Grafana Loki (logs):
+  #   loki:
+  #     endpoint: "http://loki:3100/loki/api/v1/push"
+  #
+  # Jaeger:
+  #   otlp/jaeger:
+  #     endpoint: "jaeger:4317"
+  #     tls:
+  #       insecure: true
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug]
+    logs:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug]